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Do V, Lee SH, Jang E, Lee JH, Lee JW, Lee JT, Cho WI. Aqueous Quaternary Polymer Binder Enabling Long-Life Lithium-Sulfur Batteries by Multifunctional Physicochemical Properties. ACS APPLIED MATERIALS & INTERFACES 2022; 14:19353-19364. [PMID: 35446031 DOI: 10.1021/acsami.2c00420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Lithium-sulfur batteries (LSBs) have been considered promising candidates for application in high-density energy storage systems owing to their high gravimetric and volumetric energy densities. However, LSB technology faces many barriers from the intrinsic properties of active materials that need to be solved to realize high-performance LSBs. Herein, an aqueous binder, that is, PPCP, based on polyethyleneimine (PEI), polyvinylpyrrolidone (PVP), citric acid (CA), and polyethylene oxide (PEO), was developed. The synthesized PPCP binder has incredible mechanical properties, suitable viscosity, and essential functional groups for developing an effective and reliable LSB system. This study demonstrates that CA is crucial in cross-linking PEI-PVP polymer molecules, and PEO segments significantly enhance the flexibility of the PPCP binder; thus, the binder can mechanically stabilize the cathode structure over many operating cycles. The redistribution of active materials during the charge-discharge processes and reduction of the shuttle effect originate from the excellent chemical interactions of PPCP with lithium polysulfides, which is confirmed by the density functional theory calculation, enabling an ultra-long electrochemical cycle life of 1800 cycles with a low decay rate of 0.0278% cycle-1.
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Affiliation(s)
- Vandung Do
- Center for Energy Storage Research, Clean Energy Institute, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Seung Hun Lee
- Center for Energy Storage Research, Clean Energy Institute, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
- Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea
| | - Eunji Jang
- Center for Energy Storage Research, Clean Energy Institute, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
- Department of Chemistry, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Jung-Hoon Lee
- Computational Science Research Center, Advanced Material Research Division, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Jae-Woo Lee
- R&D Division, Teratechnos Co., Ltd., Sejong 30011, Republic of Korea
| | - Jung Tae Lee
- Center for Energy Storage Research, Clean Energy Institute, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
- Department of Plant and Environmental New Resources, Kyung Hee University, Yongin, Gyeonggi-do 17104, Republic of Korea
| | - Won Il Cho
- Center for Energy Storage Research, Clean Energy Institute, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
- Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea
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